Compress PDF Online
Reduce PDF file size with PDF.it. Compress PDFs for faster sharing, easier uploads, and smaller email attachments — quick and browser-based.
Use PDF.it's Compress PDF tool to reduce PDF file size in seconds. Perfect for email attachments, upload limits, and faster sharing — upload your PDF, compress it, and download a smaller file instantly.
- ✓ Reduce PDF size quickly for email and uploads
- ✓ Keep PDFs readable after compression
- ✓ Works on Mac, Windows, iOS, Android, and Linux
- ✓ No installation — compress PDFs in your browser
Drop your files here
or click to browse files
Supported formats: .pdf
Reduce PDF File Size for Email
Many services cap attachment sizes. PDF.it helps shrink PDFs so they're easier to send and upload without splitting.
Compress Scanned & Image-Heavy PDFs
Scans and photo-based PDFs can be huge. PDF compression reduces image data to create a smaller file while keeping pages usable.
Fast Online Compression
Upload, compress, download. No software required — PDF.it runs directly in your browser on any device.
How to Compress a PDF
Upload your PDF
Drag and drop or click to choose a file
Choose compression level
Light, Medium, or Extreme reduction
Download your PDF
Get your compressed file instantly
Frequently Asked Questions
How do I compress a PDF with PDF.it?
Upload your PDF, click Compress PDF, then download the smaller file.
Will compressing a PDF reduce quality?
Compression can reduce file size by optimizing images and data. Text usually remains readable, but image-heavy PDFs may lose some detail depending on compression level.
Why is my PDF still large after compression?
If the PDF is already optimized or contains high-resolution images, the size may not drop much. Try splitting the PDF into smaller parts.
Can PDF.it compress scanned PDFs?
Yes — scanned PDFs are often the best candidates for compression because they contain large embedded images.
Can I compress a PDF on my phone?
Yes. PDF.it works in mobile browsers — upload, compress, and download directly on iPhone or Android.
What is the maximum PDF size I can compress?
Free accounts can upload files up to 25MB. Pro and Business accounts can upload up to 200MB.